Reclocking device for the Schiit Gungnir?

OK, here’s what I’ve tested so far:
Different transports...both the ARC and NAD CDP’s present a hard edge to the sound. This is not at all what is referred to as "glare," but the music is sounding too bright; i.e., violins have a steel string quality to them and not a natural timbre.

I stopped using the Oyaide BNC coax cable since it is very detailed and am using a Mogami, which previous experience has proven that it sounds very natural, but lacks a tight low-end.

After playing Classical disks, I switched to female rock singers. These are well mastered CDs, but thru the Schiit the vocals are sibilant. Strings on acoustic guitar sound bright, not natural or organic. When I play these disks on the ARC, the vocals have no sibilance and sound very nice. The tweeters on my Gallo speakers reproduce female vocals very well.
The Schiit does create better imaging and a lower noise floor than the dedicated CDP. It sounds wonderful.

I thought that a multi-bit ladder DAC is supposed to interpolate the data on the frequency curve more accurately and smoother than delta-sigma. So why is the analogue stage outputting high frequencies in this form?
Next, I will track down my USB cable. I also have a pair of bookshelf speakers to swap into the system.

Found this review regarding the Wyred 4 Sound Remedy...

I used the Remedy between my Rega Apollo and Schiit Gungnir Multibit. Since the Rega was an older CD player the remedy improved the clock timing before input to the Schiit DAC. With the better input to the DAC the sound improved in all possible ways and continued to improve over time (break-in period).

150 hours is often not enough for a DAC...you maybe just don't like the Schiit...they get great reviews but many also do not particularly like them also...

The Gallos are good, no need to replace them w/bookshelf speakers. My guess is that the Schiit is revealing distortions from somewhere up the chain. Trying the Intona, Remedy, Schiit Wyrd or even a Jitterbug would all be worthwhile experiments. The Schiit will definitely allow you to hear differences between digital cables which can affect exactly what your issue is. 
Since you are worried about the 15day policy, I would contact Schiit now and tell them about what you hear, even linking them to this thread. Ask their suggestions and perhaps you could ask for an extra 15 days to figure it out. They might make an exception; it can't hurt to ask. Cheers,
Spencer

I thought that a multi-bit ladder DAC is supposed to interpolate the data on the frequency curve more accurately and smoother than delta-sigma. 

Interpolation has nothing to do with the DAC architecture - this is the domain of the digital filter. Schiit's claim to fame is that their oversampling filter 'preserves the original samples'. Rob Watts of Chord Electronics wrote an interesting post on this subject over at Head-Fi (link here).

My own first-hand experience with a Modi Multibit in my system as well as listening to other Schiit DAC's (Gungnir Multibit and Yggdrasil) at head-fi meets have taught me that the overall Schiit house sound can be rather forward and aggressive at times. I did detect a slight 'edge' to vocals as well as plucked guitar when the Modi Multibit was in my system. So I don't think you're hearing things that aren't there. However, some of it was reduced by keeping the DAC powered on for at least 24 hours. Are you doing the same for the Gungnir?